Add fmt and lint commands

BUILD.bazel

@@ -31,6 +31,7 @@ go_library(
     visibility = ["//visibility:private"],
     deps = [
         "//bazelutil:go_default_library",
+        "//command/fmt:go_default_library",
         "//command/install:go_default_library",
         "//command/release:go_default_library",
         "//command/targets:go_default_library",

README.md

@@ -154,3 +154,11 @@ $ bazel release \
     --platform=windows_amd64 \
     //:bzl
 ```
+
+### `$ bazel lint`
+
+Print linting issues in build files (buildifier).
+
+### `$ bazel lint`
+
+Fix formatting issues in build files (buildifier).

WORKSPACE

@@ -1,7 +1,5 @@
 workspace(name = "io_bzl_bzl")
 
-load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive", "http_file")
-
 local_repository(
     name = "build_stack_rules_proto",
     path = "/home/pcj/go/src/github.com/stackb/rules_proto",
@@ -114,7 +112,7 @@ go_repository(
 
 go_repository(
     name = "com_google_bazelbuild_buildtools",
-    commit = "a861d1c9f86278f04ae7719ef48d22016781d766",
+    commit = "8135d8f1de24e6cb453be56ce061c922bf279f2c",
     importpath = "github.com/bazelbuild/buildtools",
 )
 

app.go

@@ -8,6 +8,7 @@ import (
 	"github.com/urfave/cli"
 
 	"github.com/bzl-io/bzl/bazelutil"
+	fmtcmd "github.com/bzl-io/bzl/command/fmt"
 	"github.com/bzl-io/bzl/command/install"
 	"github.com/bzl-io/bzl/command/release"
 	"github.com/bzl-io/bzl/command/targets"
@@ -54,9 +55,11 @@ func NewApp() *App {
 	// Add commands
 	app.Commands = []cli.Command{
 		*install.Command,
-		*targets.Command,
 		*release.Command,
 		*use.Command,
+		*targets.Command,
+		*fmtcmd.FmtCommand,
+		*fmtcmd.LintCommand,
 	}
 
 	instance := &App{

command/fmt/BUILD.bazel

@@ -0,0 +1,15 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["fmt.go"],
+    importpath = "github.com/bzl-io/bzl/command/fmt",
+    visibility = ["//visibility:public"],
+    deps = [
+        "@com_github_urfave_cli//:go_default_library",
+        "@com_google_bazelbuild_buildtools//build:go_default_library",
+        "@com_google_bazelbuild_buildtools//differ:go_default_library",
+        "@com_google_bazelbuild_buildtools//tables:go_default_library",
+        "@com_google_bazelbuild_buildtools//warn:go_default_library",
+    ],
+)